Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

ACERACEAE

MAPLE FAMILY

James R. Shevock

Shrubs, trees, sometimes monoecious, dioecious, or with staminate and bisexual flowers
Leaves opposite, generally simple, generally palmately lobed (rarely pinnate), generally deciduous; stipules 0
Inflorescence: panicle, raceme, or umbel-like
Flower small; perianth generally ± yellowish green; sepals (4)5, free; petals generally 5 (sometimes 0, 4, or 6), free, generally sepal-like; stamens generally 8 (sometimes 5, 10, or 12), generally attached to edge of nectary disk; ovary superior, chambers 2, each 2-ovuled
Fruit: generally pair of achenes, conspicuously winged
Seed generally 1 per achene
Genera in family: 2 genera, ± 120 species: n temp, tropical mtns (Dipteronia : 2 species: China). Some Acer important as timber or ornamental, often has bright autumn colors
Reference: [Ogata 1967 Bull Tokyo U For 63:89–206]

ACER

MAPLE


Leaf simple or pinnately compound
Inflorescence: flower clusters drooping, generally appearing before or with emerging leaves
Fruit paired, each with elongate wing ribbed on proximal side
Species in genus: ± 118 species: n hemisphere
Etymology: (Latin name for maple)

Native

A. macrophyllum Pursh

BIG-LEAF MAPLE

Tree 5–30 m
Stem: twigs coarse, glabrous, greenish to brownish
Leaf: petiole 5–12 cm; blade 10–25 cm wide, lobes 3–5, deep, irregularly few-toothed
Inflorescence long, pendent, > 30-flowered; staminate and bisexual flowers on same raceme
Flower: petals present
Fruit variable; body brown-hairy; wings spreading < 90°
Ecology: Common. Streambanks, canyons
Elevation: < 1500 m.
Bioregional distribution: California Floristic Province (except Great Central Valley)
Distribution outside California: to Alaska
Horticultural information: DRN: 4, 5, 6 &IRR: 1, 2, 3, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.

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